World Wide Telescope mining the Sky using Web Services Information At Your Fingertips for astronomers. Jim Gray Microsoft Research Alex Szalay Johns Hopkins University.
Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.
Jim Gray Microsoft Research
Alex Szalay Johns Hopkins University
How to build the World Wide Telescope?Web Services & Grid Enable Virtual Observatoryhttp://www.astro.caltech.edu/nvoconf/http://www.voforum.org/
IRAS 100mWhy Astronomy Data?
Q11: Find all elliptical galaxies with spectra that have an anomalous emission line.
Q12: Create a grided count of galaxies with u-g>1 and r<21.5 over 60<declination<70, and 200<right ascension<210, on a grid of 2’, and create a map of masks over the same grid.
Q13: Create a count of galaxies for each of the HTM triangles which satisfy a certain color cut, like 0.7u-0.5g-0.2i<1.25 && r<21.75, output it in a form adequate for visualization.
Q14: Find stars with multiple measurements and have magnitude variations >0.1. Scan for stars that have a secondary object (observed at a different time) and compare their magnitudes.
Q15: Provide a list of moving objects consistent with an asteroid.
Q16: Find all objects similar to the colors of a quasar at 5.5<redshift<6.5.
Q17: Find binary stars where at least one of them has the colors of a white dwarf.
Q18: Find all objects within 30 arcseconds of one another that have very similar colors: that is where the color ratios u-g, g-r, r-I are less than 0.05m.
Q19: Find quasars with a broad absorption line in their spectra and at least one galaxy within 10 arcseconds. Return both the quasars and the galaxies.
Q20: For each galaxy in the BCG data set (brightest color galaxy), in 160<right ascension<170, -25<declination<35 count of galaxies within 30"of it that have a photoz within 0.05 of that galaxy.
Q1: Find all galaxies without unsaturated pixels within 1' of a given point of ra=75.327, dec=21.023
Q2: Find all galaxies with blue surface brightness between and 23 and 25 mag per square arcseconds, and -10<super galactic latitude (sgb) <10, and declination less than zero.
Q3: Find all galaxies brighter than magnitude 22, where the local extinction is >0.75.
Q4: Find galaxies with an isophotal surface brightness (SB) larger than 24 in the red band, with an ellipticity>0.5, and with the major axis of the ellipse having a declination of between 30” and 60”arc seconds.
Q5: Find all galaxies with a deVaucouleours profile (r¼ falloff of intensity on disk) and the photometric colors consistent with an elliptical galaxy. The deVaucouleours profile
Q6: Find galaxies that are blended with a star, output the deblended galaxy magnitudes.
Q7: Provide a list of star-like objects that are 1% rare.
Q8: Find all objects with unclassified spectra.
Q9: Find quasars with a line width >2000 km/s and 2.5<redshift<2.7.
Q10: Find galaxies with spectra that have an equivalent width in Ha >40Å (Ha is the main hydrogen spectral line.)
50K Spectra with ~30 lines/
~1,000 IO/cpu sec ~ 64 MB IO/cpu sec
Selectcast((u-g) as int) as ug,
cast((g-r) as int) as gr,
cast((r-i) as int) as ri,
cast((i-z) as int) as iz,
count(*) as Population
group bycast((u-g) as int), cast((g-r) as int),
cast((r-i) as int), cast((i-z) as int)
order by count(*)
selectobjId, dbo.fGetUrlEq(ra,dec) as url --return object ID & url
sqrt(power(rowv,2)+power(colv,2)) as velocity
fromphotoObj -- check each object.
where (power(rowv,2) + power(colv, 2)) -- square of velocity
between 50 and 1000 -- huge values =error